Clward1958 Clward1958

11-02-2016
Mathematics

Answered

Which number is not a composite number 2 9 15 21

Verified Answer :

Anonymous Anonymous

11-02-2016

2 is not a composite number but it is actually a prime number because it is only divisible by one and itself and only composite numbers have more than just 2 factors so since 2 only has 2 factors, it is a prime number.

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Anonymous Anonymous

11-02-2016

Factors:-

2 = 1, 2 (Prime)
9 = 1, 3, 9 (Composite)
15 = 1, 3, 5, 15 (Composite)
21 = 1, 3, 7, 21 (Composite)

So, 2 is not a composite number in this list.

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